package api;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import lombok.SneakyThrows;
import model.Article;
import util.AppVar;
import util.DBUtils;
import util.ResultUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

/**
 * @Author：fish
 * @Date：2023/4/8 18:08
 */
@WebServlet("/artdetail")
public class ArtDetailServlet extends HttpServlet {
    @SneakyThrows
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        Article article = new Article();
        String msg = "未知错误！";
        //1.先得到前端的参数并效验
        String aidStr = req.getParameter("aid");
        if (!StrUtil.isBlank(aidStr)) {
            //2.查询数据库获取文章详情
            Connection connection = DBUtils.getConnection();
            String sql = "select * from article where aid=?";
            PreparedStatement statement = connection.prepareStatement(sql);
            statement.setInt(1,Integer.valueOf(aidStr));
            ResultSet resultSet = statement.executeQuery();
            if (resultSet.next()) {
                article.setAid(resultSet.getInt("aid"));
                article.setTitle(resultSet.getString("title"));
                article.setContext(resultSet.getString("context"));
                String ctime = resultSet.getString("createtime");
                article.setCreatetime(ctime.substring(0,ctime.lastIndexOf(".")));
                article.setReadcount(resultSet.getInt("readcount"));
            }
            msg = "";
            DBUtils.close(resultSet,statement,connection);
        }else {
            msg = "参数错误!";
        }
        //3.将结果返回给前端
        resp.setContentType(AppVar.RESPONSE_CONTENTTYPE_JSON);
        resp.getWriter().println(JSONUtil.toJsonStr(
                ResultUtils.toResult(200,article,msg)));
    }
}
